WO2020258370A1

WO2020258370A1 - Battery module

Info

Publication number: WO2020258370A1
Application number: PCT/CN2019/095040
Authority: WO
Inventors: 章华
Original assignee: 江苏时代新能源科技有限公司
Priority date: 2019-06-28
Filing date: 2019-07-08
Publication date: 2020-12-30
Also published as: EP3787060A4; CN209747613U; EP3787060B1; EP3787060A1

Abstract

The present application relates to the field of energy storage devices, and in particular, to a battery module, comprising a lower housing, a plurality of battery cells accommodated in the lower housing and stacked in sequence, and a heat conducting plate. A slot is formed in the lower housing. An inserting portion is formed on the heat conducting plate. The inserting portion is fitted to the slot by insertion. According to the battery module provided by the present application, a slot is formed in the lower housing, an inserting portion is formed on the heat conducting plate, and the heat conducting plate and the lower housing are fixed by means of the insertion fit between the inserting portion and the slot, and a stable connecting structure can be formed, thereby ensuring the structural stability of the lower housing.

Description

Battery module

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on June 28, 2019, with the application number 201921005581.2 and the invention name "battery module", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of energy storage devices, and in particular to a battery module.

Background technique

The energy storage system of a new energy vehicle is usually realized by a battery module. The existing battery module includes a metal lower shell, which will produce splashes when welding with other parts such as the upper cover, which leads to the failure of other parts. . In addition, the weight of the metal lower shell is large, and there are many parts that need to be insulated. Once the insulation function of some parts fails, it will cause quality problems of the battery module.

In order to dissipate the heat of the battery module, a heat conduction plate is usually provided. When the lower housing is welded to the heat conduction plate, the above-mentioned splash problem also exists, and how to achieve a stable connection between the lower housing and the heat conduction plate is currently urgently needed technical problem.

Application content

The purpose of this application is to provide a battery module to solve the problems in the prior art and realize the stable connection between the lower casing and the heat conducting plate.

The present application provides a battery module, which includes a lower casing, a plurality of battery cells stacked in sequence and a heat conducting plate accommodated in the lower casing;

The lower housing is formed with a card slot;

The heat conducting plate is formed with a plug-in portion, and the plug-in portion is plug-in-fitted with the card slot.

Preferably, the material of the lower shell is an insulating material.

Preferably, the material of the heat conducting plate is metal.

Preferably, a receiving hole is formed in the plug-in part;

The lower shell forms a hot riveting connection part in the receiving hole.

Preferably, the lower housing includes a pair of side plates and a pair of bent plates;

Each of the side plates includes a first plate and a second plate connected in an L shape; the first plate extends in the height direction of the battery module, and the second plate extends in the width direction of the battery module;

Each of the bent plates includes a third plate and a fourth plate connected in an L shape; the third plate extends along the height direction of the battery module, and the third plate is connected to the first plate, so The fourth plate extends along the width direction of the battery module;

The second board, the third board and the fourth board enclose the card slot.

Preferably, the side plate and the bent plate are integrally injection molded.

Preferably, the number of the accommodating holes is multiple, and the plurality of accommodating holes are respectively arranged on the edge portion of the heat conducting plate along the length direction of the battery module.

Preferably, the lower housing further includes a pair of end plates, which are arranged at both ends of the battery module along the length direction, and the pair of end plates are respectively fixedly connected to the pair of side plates.

Preferably, a thermal conductive structural glue fixed to the bottom of the lower casing is provided in the lower casing.

Preferably, the battery module further includes an upper cover, and the upper cover and the lower casing together form a receiving cavity for accommodating the plurality of battery cells.

The technical solution provided by this application can achieve the following beneficial effects:

The battery module provided by the present application includes a lower casing, a plurality of battery cells stacked in sequence and a heat conducting plate accommodated in the lower casing. The lower shell is formed with a card slot, the heat conducting plate is formed with a plug-in part, and the plug-in part is mated with the card slot. Through the insertion of the heat-conducting plate and the card slot, a stable connection structure can be formed between the heat-conducting plate and the lower casing, thereby ensuring the structural stability of the battery module.

It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the application.

Description of the drawings

In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is an exploded schematic diagram of a battery module provided by an embodiment of the application;

Figure 2 is a top view of a battery module provided by an embodiment of the application;

Figure 3 is a cross-sectional view taken along line A-A in Figure 2;

Figure 4 is an enlarged view of B in Figure 3;

Figure 5 is a sectional view of the mating state between the lower shell and the heat conducting plate after hot riveting;

6 is an exploded schematic diagram of the structure of the lower shell and the heat conducting plate in the battery module provided by the embodiment of the application;

Figure 7 is an enlarged view of C in Figure 6;

Fig. 8 is an enlarged view of D in Fig. 6.

Reference signs:

1- Battery module;

11- Lower shell;

111-side plate;

111a-first board;

111b-second board;

112-Bending plate;

112a-the third board;

112b-fourth board;

112c-Hot riveting connection part;

113-end plate;

114-card slot;

12- Battery cell;

13- Upper cover;

14- Structural adhesive;

15- Heat conduction board;

151-plugging part;

152-accommodating hole.

The drawings here are incorporated into the specification and constitute a part of the specification, show embodiments that conform to the application, and are used together with the specification to explain the principle of the application.

Detailed ways

The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

FIG. 1 is an exploded schematic diagram of a battery module provided by an embodiment of the application. As shown in FIG. 1, an embodiment of the present application provides a battery module 1, including a lower casing 11 and a lower casing 11 A plurality of battery cells 12 are sequentially stacked. The battery module 1 further includes an upper cover 13, and the upper cover 13 and the lower casing 11 together form a receiving cavity for accommodating the plurality of battery cells 12.

The battery cell 12 is provided with an electrode assembly and an electrolyte, and the electrode assembly and the electrolyte react electrochemically to output electrical energy. The heat generated during the reaction needs to be dissipated in time, so the battery module 1 also includes a heat conducting plate 15 for heat dissipation.

Specifically, the battery module 1 may include a pair of side plates 111 and a pair of end plates 113. The side plates 111 and the end plates 113 fix the battery cells 12 to limit the expansion of the battery cells 12. The heat conducting plate 15 may be connected to the end of the side plate 111 and the end plate 113 away from the upper cover 13, that is, the bottom end of the side plate 111 and the end plate 113. When a plurality of battery cells 12 are accommodated in the lower casing 11, heat can be dissipated through the heat conducting plate 15.

2 is a top view of a battery module provided by an embodiment of the application, FIG. 3 is a cross-sectional view along the line A-A in FIG. 2, and FIG. 4 is an enlarged view of B in FIG. 3.

2 to 4, the lower housing 11 is formed with a card slot 114, and the heat-conducting plate 15 is formed with a plug-in portion 151. The plug-in portion 151 may be formed at the edge of the heat-conducting plate 15. The plug-in portion 151 and the card slot 114 Mating fit. The fitting tolerance between the plug-in portion 151 and the card slot 114 can be set to make the plug-in connection between the plug-in portion 151 and the card slot 114 closer, so as to achieve a stable connection between the heat conducting plate 15 and the lower housing 11. The structural strength of the battery module 1 is ensured.

The lower shell 11 and the heat conducting plate 15 adopt the above-mentioned split structure, and then use the inserting part 151 and the card slot 114 to insert and fix, so that the lower shell 11 of insulating material can be used to solve the welding process of the lower metal shell. In addition, the weight reduction of the battery module 1 can be achieved, and the heat conducting plate 15 made of metal material can be used to dissipate the battery cells 12. In addition, the lower housing 11 using insulating materials can also solve the problem of many insulating parts of the metal lower housing and easy insulation failure in the prior art.

Preferably, a receiving hole 152 is formed in the insertion portion 151, and the insertion portion 151 is inserted into the card slot 114, and the lower housing 11 forms a hot riveting connection portion 112c in the receiving hole 152, refer to FIG. 5.

Figure 5 is a cross-sectional view of the mating state between the lower housing and the heat conducting plate after hot riveting. First, referring to Figure 4, insert the inserting portion 151 into the card slot 114, and make the receiving hole 152 completely enter the card slot 114, and then Hot riveting is performed on the bottom of the lower case 11 to form the structure shown in FIG. 5. In the embodiment shown in FIG. 5, the lower housing 11 includes a bent plate 112, and the bottom of the fourth plate 112d of the bent plate 112 is hot riveted to form a hot riveted connection portion 112c, which will be described in detail below.

A part of the material of the lower shell 11 is melted under the hot riveting process, and the melted part flows into the receiving hole 152, and after cooling, a hot riveting connecting portion 112c as shown in FIG. 4 is formed, and the heat conducting plate 15 is clamped. By forming the hot riveting connection portion 112c in the receiving hole 152 to fix the heat-conducting plate 15 and the lower housing 11, a stable connection structure can be formed, preventing the heat-conducting plate 15 from falling out of the slot 114, and further ensuring the structure of the lower housing 11. stability.

As mentioned above, preferably, the material of the lower housing 11 is a polymer material with insulating properties, which is formed by molding methods such as injection molding, extrusion, and compression molding. In this way, the problem of spattering of the metal lower shell during welding in the prior art and failure of other components will not occur, and the quality of the battery module is improved.

The shape of the battery cell 12 may be square or cylindrical, which is not limited herein.

The material of the upper cover 13 may also be a polymer material with insulating properties, which is formed by molding methods such as injection molding, extrusion, and molding.

Preferably, the material of the heat conducting plate 15 is metal, and its thermal conductivity is higher than the thermal conductivity of the lower casing 11 and the upper cover 13. Specifically, metal materials such as copper and aluminum can be used, which are not further limited here.

6 is an exploded schematic view of the structure of the lower casing and the heat conducting plate in the battery module provided by the embodiment of the application. FIG. 7 is an enlarged view of C in FIG. 6, and FIG. 8 is an enlarged view of D in FIG. 6 .

As shown in FIGS. 6 and 7, the above-mentioned card slot 114 is formed at the bottom of the lower casing 11 in the height direction of the battery module 1, that is, at an end away from the upper cover 13. After this arrangement, when the insertion portion 151 of the heat conducting plate 15 is inserted into the card slot 114, the heat conducting plate 15 is arranged opposite to the upper cover 13, and the area of the heat conducting plate 15 is relatively large, which can dissipate the battery cell 12 in the largest area. , Play a better heat dissipation effect.

As a preferred implementation, referring to Figures 4 to 7, the lower housing 11 includes a pair of side plates 111 and a pair of bent plates 112, and each side plate 111 includes a first plate 111a and a second plate connected in an L shape. Two boards 111b. The first plate 111a extends along the height direction of the battery module 1 (Z direction), and the second plate 111b extends along the width direction (X direction) of the battery module 1. Each bent plate 112 includes a third plate 112a and a fourth plate 112b connected in an L shape, the third plate 112a extends along the height direction (Z direction) of the battery module 1, and the third plate 112a and the first plate 111a Connected, the fourth plate 112b extends along the width direction (X direction) of the battery module 1, and the second plate 111b, the third plate 112a, and the fourth plate 112b enclose a slot 114.

The first plate 111a, the second plate 111b, the third plate 112a, and the fourth plate 112b may be integrally injection-molded, that is, the side plate 111 and the bent plate 112 are integrally injection-molded, thereby forming the above-mentioned card slot 114.

Since the above-mentioned card slot 114 is formed by the side plate 111 and the bending plate 112, the card slot 114 formed in the above-mentioned structure can extend along the length direction (Y-direction) of the battery module 1, and is mated with the heat conducting plate 15 Later, the mating relative area is larger, and the connection reliability of the heat conducting plate 15 is higher.

As shown in FIG. 8, further, the heat conducting plate 15 may be a rectangular plate, and the number of the receiving holes 152 is multiple, and the multiple receiving holes 152 are respectively arranged on the heat conducting plate along the length direction (Y direction) of the battery module 1. The edge part of 15. In this way, after the thermal riveting between the heat conducting plate 15 and the lower casing 11, only a small part of the heat conducting plate 15 absorbs the heat, which will not cause the thermal deformation of the heat conducting plate 15 when the entire heat conducting plate 15 is heated. Once the heat-conducting plate 15 is deformed, the contact area with the external heat-conducting component will decrease, which will affect the heat-conducting effect. Therefore, this structure can better ensure the heat conduction effect of the heat conduction plate 15. Moreover, only a small part of the heat-conducting plate 15 absorbs heat, which will not cause the heat-conducting plate 15 to be deformed as large as in the prior art, the flatness will not be greatly affected, and the battery cell 12 will not shake after installation. , Improve the stability of the battery module 1.

Preferably, the lower housing 11 further includes a pair of end plates 113, which are arranged at both ends of the battery module 1 along the length direction, and the pair of end plates 113 are respectively fixedly connected to the pair of side plates 111, thereby restricting the battery cells 12 The expansion.

The above-mentioned card slot 114 may also be formed on the end plate 113, and the bent plate 112 and the end plate 113 form the card slot 114, so that the card slot 114 extends along the width direction (X direction) of the battery module 1. Corresponding to this embodiment, the accommodating holes 152 may be arranged along the width direction (X direction) of the battery module 1 at the edge portion of the heat conducting plate 15.

Preferably, a structural glue 14 fixed to the lower casing 11 is provided in the lower casing 11, and the structural glue 14 is preferably a thermal conductive structural glue. When assembling the battery module 1, the lower casing 11, the battery cells 12 and the upper cover 13 are assembled first, and then the glue is applied, so that the glue application operation can be monitored in real time and the glue application effect is ensured. After the glue is applied, the insertion portion 151 of the heat-conducting plate 15 is inserted into the slot 114 of the lower housing 11 to realize a stable connection between the heat-conducting plate 15 and the lower housing 11. In addition, the thermally conductive structural adhesive can contribute to heat transfer and further improve the heat dissipation effect of the battery module 1.

After inserting the insertion portion 151 of the heat conducting plate 15 into the card slot 114 of the lower housing 11, hot riveting is performed, and the molten material on the lower housing 11 flows into the receiving hole 152 of the heat conducting plate 15, and a hot riveting connection is formed after cooling. The portion 112c further improves the connection stability between the heat conducting plate 15 and the lower casing 11, and ensures the overall structural strength of the battery module 1.

The above are only preferred embodiments of the application, and are not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A battery module, which is characterized by comprising a lower casing, a plurality of battery cells stacked in sequence and a heat conducting plate accommodated in the lower casing;

The lower housing is provided with a card slot;

The heat conducting plate is provided with a plug-in part, and the plug-in part is in plug-in fit with the card slot.
The battery module according to claim 1, wherein the material of the lower casing is an insulating material.
The battery module according to claim 1, wherein the material of the heat conducting plate is metal.
The battery module according to claim 1, wherein a receiving hole is formed in the plug-in portion;

The lower shell forms a hot riveting connection part in the receiving hole.
The battery module according to claim 4, wherein the lower housing includes a pair of side plates and a pair of bent plates;

Each of the side plates includes a first plate and a second plate connected in an L shape; the first plate extends along the height direction of the battery module, and the second plate extends along the width direction of the battery module;

Each of the bent plates includes a third plate and a fourth plate connected in an L shape; the third plate extends along the height direction of the battery module, and the third plate is connected to the first plate, so The fourth plate extends along the width direction of the battery module;

The second board, the third board and the fourth board enclose the card slot.
The battery module of claim 5, wherein the side plate and the bent plate are integrally injection molded.
The battery module according to claim 4, wherein the number of the receiving holes is multiple, and the multiple receiving holes are respectively arranged on the heat conducting plate along the length direction of the battery module. The edge part.
The battery module according to claim 4, wherein the lower housing further comprises a pair of end plates, which are arranged at both ends of the battery module along the length direction, and the pair of end plates are respectively connected to the A pair of side plates are fixedly connected.
The battery module according to claim 1, wherein a thermal conductive structural glue fixed to the bottom of the lower casing is provided in the lower casing.
The battery module according to claim 1, wherein the battery module further comprises an upper cover, and the upper cover and the lower casing together form a receiving cavity for accommodating the plurality of battery cells.